Just found this website, and its great. I have a few questions i thought someone might help me with. i have an 87 s-10 2.5l with 4 speed. i have been getting about 27mpg with it, however 2 weeks ago i went from p20570r14 to p20570r15 on the truck. the same weekend i had to change the valve cover gasket, and of course had to remove the egr valve to get to a bolt.I put the egr valve back on with a new gasket. ever since that weekend my milage has gone down to about 22mpg. so my questions are:
will the larger tires affect my mpg that much, or did i possibly mess something up with the egr valve. and how do i check it. i just recently tuned up the truck and it runs ok for the 2.5l. it has always had a "slight miss when idling and i cant seem to find out what causes this. i really would like to get the mpg back up to about 27mpg as i drive it everyday over 120miles roundtrip back and forth to work. any suggestions will be appreciated.
Tks,
Doc